Renovation or Alteration – How NYC DOB Understands It

Renovation – in everyday language, this means any work that improves, changes, or repairs a property, done by an authorized person. This work must follow NYC building and zoning rules and, when needed, must have the right DOB* permits and approvals.

In NYC DOB paperwork, most “renovation” projects are actually filed as building alterations. The DOB uses the word “alteration” on forms and permits, while “renovation” is the everyday word used by owners and brokers for the same type of work.

Basement renovation

Basement renovation in NYC often involves converting storage or mechanical space into usable or habitable rooms. Because basements must meet strict rules for ceiling height, egress, ventilation, and waterproofing, most basement renovation projects require DOB‑filed alteration permits and plans prepared by a licensed architect or engineer.

Interior renovation

Interior renovation usually means changing layouts, finishes, or building systems inside an existing apartment or house. Cosmetic work like painting or replacing flooring is often permit‑exempt, but moving walls, relocating plumbing or electrical, or changing room layouts typically requires an alteration permit filed with the DOB.